GeoToolbox

Geo Toolbox is an offline geography studio for students and curious travelers. Convert coordinates, estimate distances and day length, compare city time zones, look up climate belts, quiz yourself, and keep private study notes—without an account, ads, or the cloud. WHY GEO TOOLBOX • 100% offline — works in airplane mode • Zero data collection — no tracking SDKs • No login, no ads, no in-app purchases • Built for learning, not professional surveying TOOLS • Lat/Lon Converter — switch between decimal degrees and DMS; North/South & East/West; Beijing & Shanghai examples • Great-Circle Distance — Haversine two-point distance in km, miles, or nautical miles • Time Zone Diff — compare cities with built-in UTC offsets (standard time; no daylight saving in V1.0) • Day Length — estimate sunrise, sunset, and daylight from latitude, longitude, and date, with a sun-path sketch • Climate Zones —…